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[Removing efficiency study on Cyclops cooperating with water treatment process by alternative oxidants]
Min Zhang1, Fu-yi Cui, Dong-mei Liu
1State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. zmin_2008@163.com
Huan Jing Ke Xue= Huanjing Kexue
|March 2, 2010
Summary
Chloramines achieved 100% Cyclops removal in water treatment, outperforming other pre-oxidants. Optimal removal depends on combining pre-oxidation with clarification, not just initial inactivation rates.
Area of Science:
- Environmental Science
- Water Treatment Technology
- Public Health
Background:
- Cyclops (copepods) are common freshwater organisms that can act as intermediate hosts for parasites affecting human health.
- Effective removal of Cyclops from drinking water sources is crucial for preventing waterborne diseases.
Purpose of the Study:
- To investigate the synergistic removal effects of different pre-oxidants and clarification processes on Cyclops.
- To analyze the removal mechanisms of Cyclops in various water treatment units.
- To identify optimal treatment strategies for complete Cyclops removal.
Main Methods:
- Pilot-scale testing of four pre-oxidants: chloramines, chlorine, ozone (O3), and potassium permanganate composite.
- Evaluation of different clarification treatment processes following pre-oxidation.
- Analysis of Cyclops inactivation and removal rates at each treatment stage.
Main Results:
- Chlorine showed the highest initial inactivation rate (25%), but chloramines yielded the highest removal rate (90%) after filtration.
- Chloramines, combined with a conventional activated carbon unit, achieved 100% Cyclops removal.
- Filtration units demonstrated high individual removal rates (≥50%), while air-flotation effectiveness varied with Cyclops size and activity.
Conclusions:
- Complete Cyclops removal (100%) is achievable through a synergistic approach, integrating effective pre-oxidation with appropriate clarification processes.
- The effectiveness of Cyclops removal is influenced by the interplay between pre-oxidation and clarification stages, rather than solely by the initial inactivation rate.
- Cyclops size and life activity are significant factors affecting removal efficiency in treatment units like filtration and air-flotation.
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